package com.sky.service.impl;


import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间内的店铺营业额
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> datesList = new ArrayList<>();

        datesList.add(begin);
        while (!begin.equals(end)){
            //计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            datesList.add(begin);
        }


        //存放每条的营业额
       List<Double> trunoverList = new ArrayList<>();
        for (LocalDate date : datesList){
            //查询date日期对应的营业额，营业额是指状态为已完成的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover =  orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            trunoverList.add(turnover);
        }

        //封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(datesList, ","))
                .turnoverList(StringUtils.join(trunoverList,","))
                .build();
    }

    /**
     * 统计指定时间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> datesList = new ArrayList<>();

        datesList.add(begin);
        while (!begin.equals(end)){
            //计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            datesList.add(begin);
        }
        //存放每天的新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : datesList){
            //查询date日期对应的营业额，营业额是指状态为已完成的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end",endTime);

            Integer totalUser  = userMapper.countByMap(map);
            totalUserList.add(totalUser);

            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);
        }
        return new UserReportVO().builder()
                .dateList(StringUtils.join(datesList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 统计一定时间内的订单相关数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> datesList = new ArrayList<>();

        datesList.add(begin);
        while (!begin.equals(end)){
            //计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            datesList.add(begin);
        }
        List<Integer> allOrders = new ArrayList<>();
        List<Integer> completedOrders = new ArrayList<>();

        //遍历dataList集合，查询每天的有效订单数和订单总数
        for (LocalDate date : datesList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            //查询每天的订单总数
            map.put("begin",beginTime);
            map.put("end",endTime);
            Integer allOrder = orderMapper.countByMap(map);
            allOrders.add(allOrder);
            //查询每天的有效订单
            map.put("status",Orders.COMPLETED);
            Integer completedOrder = orderMapper.countByMap(map);
            completedOrders.add(completedOrder);
        }
        //计算时间区间内的总订单数量
        Integer totalOrderCount = allOrders.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数量
        Integer completedOrderCount = completedOrders.stream().reduce(Integer::sum).get();
        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
           orderCompletionRate = completedOrderCount.doubleValue() / totalOrderCount;
        }

        return new OrderReportVO().builder()
                .dateList(StringUtils.join(datesList,","))
                .orderCountList(StringUtils.join(allOrders,","))
                .validOrderCountList(StringUtils.join(completedOrders,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(completedOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }


    /**
     * 统计指定时间区间内销量排名top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");

        return new SalesTop10ReportVO().builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出最近30天运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库获取营业数据
        LocalDate dateBegin = LocalDate.now().plusDays(-30);
        LocalDate dateEnd = LocalDate.now().plusDays(-1);

        //查询概览数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2.通过POI将数据写道Excel文件中
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);

            //获取要填充的表格数据
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据---时间
            sheet.getRow(1).getCell(1).setCellValue("时间： "+dateBegin+"至"+dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());

            //获得第5行
            row =  sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            //填充明细数据
            for (int i=0;i<30;i++){
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData1 = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得第8+i 行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData1.getTurnover());
                row.getCell(3).setCellValue(businessData1.getValidOrderCount());
                row.getCell(4).setCellValue(businessData1.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData1.getUnitPrice());
                row.getCell(6).setCellValue(businessData1.getNewUsers());
            }

            //3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
           e.printStackTrace();
        }

    }
}
